Shanghai Daoqin Plastics Co., Ltd.

PET plastics preform production injection is 主, PET材 material products in production process in generate defect main/primary is products in bubbles, true 空泡, black spots 黑纹, this defect generate causes and solution methods lower:
　　PET plastics bottle production is use injection molding machine injection molding preform, is 我们常说 PET preform, use material is PET. PET plastics preform in injection process in if process defect, that it 就会直接反映 to bottle upper, therefore has bottle defect, need in preform upper issues. PET preform and preform bottle defect main/primary is bubbles issues, bubbles in preform injection already generate. this preform formed bottle rear in preform in products bubbles has types, generate causes is 不一样, generally according to bubbles 出现 位置 进行判断. bottle 身位置 bubbles is is defect generate, in process upper can through increase back pressure, reduce screw speed and improve/increase temperature degree and other methods solution. production efficiency reduce, this is can 忍受, therefore injection molding machine production 厂商会 through screw structure 进行处理. this 样就既 can solution bubbles issues, also reduce production efficiency, also can improve/increase production efficiency.
　　 products in 部 情况; if bubbles generate in bottle 口处, generally has 白斑, or 烧焦点, this is is gas defect standards phenomenon. is is gas defect generate, can using/adopting more grade injection, most rear use slow speed injection, reduce clamping force, improve/increase mold gas and other. bottle lower this upper 也会出现“ bubbles ”, its this 方 “ bubbles ” in has “汽”, is standards true 空泡, is due to injection holding pressure time 不够, 出现 倒流 phenomenon sink marks formed, therefore increase holding pressure time and holding pressure pressure is necessary.